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If this furnace is to be installed in the same space with other gas
appliances, such as a water heater, ensure there is an adequate
supply of combustion and ventilation air for the other appliances.
Refer to the latest edition of the National Fuel Gas Code NFPA
54/ANSI Z223.1 or CAN/CSA B149 Installation Codes or appli-
cable provisions of the local building codes for determining the
combustion air requirements for the appliances.
Most homes will require outside air be supplied to the furnace
area by means of ventilation grilles or ducts connecting directly
to the outdoors or spaces open to the outdoors such as attics
or crawl spaces.
Installation Positions
This furnace may be installed in an upright position or horizontal
on either the left or right side panel. Do not install this furnace
on its back. For
upright upflow
furnaces, return air ductwork
may be attached to the side panel(s) and/or basepan. For
hori-
zontal upflow
furnaces, return air ductwork must be attached to
the basepan. For both
upright or horizontal counterflow
furnaces,
return ductwork must be attached to the basepan (top end of
the blower compartment).
NOTE:
Ductwork must never be
attached to the back of the furnace. Contact your distributor for
proper airflow requirements and number of required ductwork
connections. Refer to “Recommended Installation Positions”
figure for appropriate installation positions, ductwork connec-
tions, and resulting airflow arrangements.
Horizontal Applications & Considerations
Horizontal applications, in particular, may dictate many of the
installation’s specifics such as airflow direction, ductwork con-
nections, flue and combustion air pipe connections, etc. The
basic application of this furnace as a horizontal furnace differs
only slightly from an upright installation. When installing a fur-
nace horizontally, additional consideration must be given to the
following:
Horizontal Furnace
F
URNACE
S
USPENSION
If suspending the furnace from rafters or joists, use 3/8" threaded
rod and 2”x2”x1/8” angle iron as shown in the following diagram.
The length of rod will depend on the application and the clear-
ances necessary.
If the furnace is installed in a crawl space it must be suspended
from the floor joist or supported by a concrete pad. Never install
the furnace on the ground or allow it to be exposed to water.
2" 2" 3/8"
ANGLE
IRON
(3
PLACES
)
X
X
D
RAIN
T
RAP
AND
L
INES
In horizontal applications the condensate drain trap is secured to
the furnace side panel, suspending it below the furnace. A mini-
mum clearance of 4 3/4 inches below the furnace must be pro-
vided for the drain trap. Additionally, the appropriate downward
piping slope must be maintained from the drain trap to the drain
location. Refer to
Condensate Drain Trap and Lines
for further
details. If the drain trap and drain line will be exposed to tempera-
tures near or below freezing, adequate measures must be taken
to prevent condensate from freezing.
L
EVELING
Leveling ensures proper condensate drainage from the heat ex-
changer and induced draft blower. For proper flue pipe drainage,
the furnace must be level lengthwise from end to end. The fur-
nace should also be level from back to front or have a slight tilt
with the access doors downhill (approximately 3/4 inches) from
the back panel. The slight tilt allows the heat exchanger conden-
sate, generated in the recuperator coil, to flow forward to the
recuperator coil front cover.
PRODUCT DESIGN
